Conclusions
More than anything else, we hope that this website gives an understanding of the complexity of the Hydrogen Economy. In order for hydrogen to operate as a working energy currency, markets must be developed for the production, applications, storage and infrastructure for hydrogen. The main environmental benefits are the atmospheric effects a Hydrogen Economy would produce. However, measuring these benefits is difficult because a great amount of uncertainty exists about the magnitude and even the direction of the effect of hydrogen on the atmosphere.
The sheer scale of the Hydrogen Economy suggests that government involvement may be a necessary for its success. Many countries around the world are busily investigating and experimenting with the use of hydrogen as a replacement for fossil fuels as an energy currency.

Possible Structure of Hydrogen Economy. Source: http://www.ch2bc.org/
However, the establishment of a hydrogen economy requires the development of hydrogen technology and infrastructure. Hydrogen currently costs more per gallon equivalent of gasoline, but this cost could come down with the development of a cost efficient production system. In addition to a production system, a hydrogen economy needs reliable transportation and storage systems. The challenge arises from moving and containing nature's lightest weight gas without compromising its purity. Moreover, some scientists have brought up questions about hydrogen's environmental virtues.
The enthusiasm shown by governments from several countries suggests that, for better or worse, hydrogen will be affecting us in the coming decades. As such, it is imperative that we understand what is required for the Hydrogen Economy to reach fruition and the limitations hydrogen may have. In this way, we can invest wisely in the future rather than depending on the promises of politicians, entrepreneurs, and philosophers.